/* ==========================================================================
   AmyTelecom Official Design System & Stylesheet
   Palette:
     - Deep Navy: #102A43 (headings, text-primary, deep badges)
     - Tech Blue: #2878E3 (primary brand, key buttons, links)
     - Light Blue: #EDF5FF (hero accents, soft card backgrounds)
     - White: #FFFFFF (base card and surface)
     - Accent Cyan: #26B4B8 (highlights, gradients, status accents)
   Framework: 02｜产品优势卡片 (Product Advantage Cards)
   ========================================================================== */

:root {
  --color-navy: #102A43;
  --color-navy-dark: #0B1D30;
  --color-navy-light: #243B53;
  --color-blue: #2878E3;
  --color-blue-hover: #1A64CA;
  --color-blue-light: #EDF5FF;
  --color-blue-soft: #DBECFE;
  --color-cyan: #26B4B8;
  --color-cyan-light: #E6FFFA;
  --color-white: #FFFFFF;
  --color-bg-page: #F8FAFC;
  --color-text-main: #102A43;
  --color-text-muted: #486581;
  --color-text-subtle: #829AB1;
  --color-border: #E2E8F0;
  --color-border-light: #EEF2F6;
  --color-card-bg: #FFFFFF;
  --color-card-shadow: 0 4px 20px -2px rgba(16, 42, 67, 0.06), 0 2px 6px -1px rgba(16, 42, 67, 0.04);
  --color-card-hover: 0 12px 30px -4px rgba(40, 120, 227, 0.12), 0 4px 10px -2px rgba(16, 42, 67, 0.06);

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --max-width: 1200px;
  --max-width-text: 820px;
  --header-height: 72px;
}

/* CSS Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.65;
  color: var(--color-text-main);
  background-color: var(--color-bg-page);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

a {
  color: var(--color-blue);
  text-decoration: none;
  transition: color 0.2s ease, transform 0.2s ease;
}

a:hover {
  color: var(--color-blue-hover);
}

img, svg {
  vertical-align: middle;
  max-width: 100%;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* Utilities */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.section {
  padding-top: 80px;
  padding-bottom: 80px;
}

@media (max-width: 768px) {
  .section {
    padding-top: 52px;
    padding-bottom: 52px;
  }
}

.section-title-wrap {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 48px;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--color-blue);
  background-color: var(--color-blue-light);
  padding: 4px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 12px;
  text-transform: uppercase;
}

.section-title {
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--color-navy);
  line-height: 1.3;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

@media (max-width: 768px) {
  .section-title {
    font-size: 1.65rem;
  }
  .section-desc {
    font-size: 0.95rem;
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 1rem;
  font-weight: 600;
  padding: 12px 26px;
  border-radius: var(--radius-md);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-blue) 0%, #1754B5 100%);
  color: var(--color-white) !important;
  box-shadow: 0 4px 14px rgba(40, 120, 227, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #3884EA 0%, var(--color-blue) 100%);
  box-shadow: 0 6px 20px rgba(40, 120, 227, 0.45);
  transform: translateY(-2px);
}

.btn-secondary {
  background: var(--color-white);
  color: var(--color-navy) !important;
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-blue);
  color: var(--color-blue) !important;
  background-color: var(--color-blue-light);
  transform: translateY(-2px);
}

.btn-outline-cyan {
  background: rgba(38, 180, 184, 0.08);
  color: var(--color-navy) !important;
  border: 1px solid var(--color-cyan);
}

.btn-outline-cyan:hover {
  background: var(--color-cyan);
  color: var(--color-white) !important;
}

.btn-block {
  width: 100%;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  display: flex;
  align-items: center;
  transition: box-shadow 0.25s ease;
}

.site-header.scrolled {
  box-shadow: 0 4px 20px rgba(16, 42, 67, 0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--color-navy) !important;
  letter-spacing: -0.02em;
}

.brand-logo-icon {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, var(--color-blue), var(--color-cyan));
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow: 0 4px 10px rgba(40, 120, 227, 0.3);
}

.brand-logo span.dot {
  color: var(--color-cyan);
}

.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 24px;
}

.nav-link {
  font-size: 0.96rem;
  font-weight: 500;
  color: var(--color-text-main);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.nav-link:hover {
  color: var(--color-blue);
  background-color: var(--color-blue-light);
}

.nav-cta-btn {
  padding: 9px 18px;
  font-size: 0.92rem;
}

.mobile-toggle {
  display: none;
  padding: 8px;
  color: var(--color-navy);
}

@media (max-width: 900px) {
  .mobile-toggle {
    display: block;
  }
  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 24px 20px;
    gap: 12px;
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
    box-shadow: 0 10px 25px rgba(16, 42, 67, 0.1);
  }
  .nav-menu.is-active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-link {
    width: 100%;
    text-align: center;
    padding: 12px;
  }
  .header-actions {
    display: none;
  }
}

/* Hero Section */
.hero-section {
  position: relative;
  background: radial-gradient(circle at 80% 20%, rgba(38, 180, 184, 0.12) 0%, transparent 45%),
              linear-gradient(180deg, #EDF5FF 0%, #FFFFFF 100%);
  padding: 80px 0 90px;
  border-bottom: 1px solid var(--color-border-light);
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 48px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(40, 120, 227, 0.08);
  border: 1px solid rgba(40, 120, 227, 0.2);
  color: var(--color-blue);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  margin-bottom: 20px;
}

.hero-badge .pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--color-cyan);
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(38, 180, 184, 0.7);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(38, 180, 184, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(38, 180, 184, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(38, 180, 184, 0); }
}

.hero-title {
  font-size: 2.75rem;
  font-weight: 850;
  line-height: 1.22;
  color: var(--color-navy);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 32px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-bottom: 32px;
}

.hero-features-list {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  padding-top: 16px;
  border-top: 1px dashed rgba(72, 101, 129, 0.25);
}

.hero-feature-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  color: var(--color-text-main);
  font-weight: 500;
}

.hero-feature-item svg {
  color: var(--color-cyan);
}

/* Hero Network Graphic (Original SVG Canvas) */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.network-card-wrap {
  position: relative;
  width: 100%;
  max-width: 460px;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: 0 20px 45px -10px rgba(16, 42, 67, 0.12), 0 1px 3px rgba(16, 42, 67, 0.05);
  border: 1px solid rgba(226, 232, 240, 0.8);
}

.network-status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border-light);
  margin-bottom: 20px;
}

.network-status-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-navy);
  display: flex;
  align-items: center;
  gap: 8px;
}

.status-badge-live {
  background: #DEF7EC;
  color: #03543F;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

.network-topo-svg {
  width: 100%;
  height: 200px;
  margin-bottom: 18px;
}

.network-metrics-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  text-align: center;
}

.metric-box {
  background: var(--color-bg-page);
  padding: 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-light);
}

.metric-val {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--color-navy);
}

.metric-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 2px;
}

@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-title {
    font-size: 2.1rem;
  }
  .hero-subtitle {
    font-size: 1.02rem;
  }
  .hero-section {
    padding: 48px 0 60px;
  }
}

/* Archetype 02: Product Advantage Cards (三栏产品优势卡片) */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.advantage-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  border: 1px solid var(--color-border);
  box-shadow: var(--color-card-shadow);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.advantage-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-blue), var(--color-cyan));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.advantage-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--color-card-hover);
  border-color: rgba(40, 120, 227, 0.3);
}

.advantage-card:hover::before {
  opacity: 1;
}

.advantage-icon-wrap {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  background: var(--color-blue-light);
  color: var(--color-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  transition: transform 0.3s ease, background 0.3s ease;
}

.advantage-card:hover .advantage-icon-wrap {
  transform: scale(1.08);
  background: linear-gradient(135deg, var(--color-blue), var(--color-cyan));
  color: var(--color-white);
}

.advantage-card-title {
  font-size: 1.35rem;
  font-weight: 750;
  color: var(--color-navy);
  margin-bottom: 12px;
}

.advantage-card-intro {
  font-size: 0.98rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 22px;
  flex-grow: 1;
}

.advantage-points-list {
  list-style: none;
  margin-bottom: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border-light);
}

.advantage-point-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--color-text-main);
  margin-bottom: 10px;
}

.advantage-point-item svg {
  flex-shrink: 0;
  margin-top: 3px;
  color: var(--color-cyan);
}

.advantage-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--color-blue);
  margin-top: auto;
}

.advantage-card-link:hover {
  gap: 10px;
}

@media (max-width: 960px) {
  .advantages-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .advantage-card {
    padding: 28px 24px;
  }
}

/* Service Scenarios (服务适用场景) */
.scenarios-section {
  background: linear-gradient(180deg, #FFFFFF 0%, #EDF5FF 100%);
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
}

.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-bottom: 30px;
}

.scenario-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  border: 1px solid var(--color-border);
  box-shadow: 0 2px 10px rgba(16, 42, 67, 0.04);
  transition: all 0.25s ease;
}

.scenario-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-blue);
  box-shadow: 0 8px 20px rgba(40, 120, 227, 0.1);
}

.scenario-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(38, 180, 184, 0.1);
  color: var(--color-navy);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.scenario-title {
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 8px;
}

.scenario-desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.55;
  margin-bottom: 16px;
}

.scenario-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.scenario-tag-item {
  font-size: 0.75rem;
  color: var(--color-navy);
  background: var(--color-bg-page);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
}

.scenario-notice-box {
  background: #FFFBEB;
  border: 1px solid #FCD34D;
  border-radius: var(--radius-md);
  padding: 16px 20px;
  font-size: 0.88rem;
  color: #92400E;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  line-height: 1.6;
}

/* Pricing Section (三栏价格卡片) */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
  margin-bottom: 36px;
}

.price-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 38px 30px;
  border: 1px solid var(--color-border);
  box-shadow: var(--color-card-shadow);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.price-card.popular {
  border: 2px solid var(--color-blue);
  box-shadow: 0 16px 36px -4px rgba(40, 120, 227, 0.18);
  transform: scale(1.02);
}

.price-card:hover {
  transform: translateY(-6px) scale(1.02);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--color-blue), var(--color-cyan));
  color: var(--color-white);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 18px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 10px rgba(40, 120, 227, 0.3);
  text-transform: uppercase;
}

.price-card-header {
  margin-bottom: 20px;
}

.price-tier-name {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-navy);
  margin-bottom: 6px;
}

.price-tier-desc {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  min-height: 42px;
}

.price-display {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 16px 0 20px;
}

.price-currency {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-navy);
}

.price-number {
  font-size: 3rem;
  font-weight: 900;
  color: var(--color-navy);
  line-height: 1;
}

.price-period {
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

.price-meta-list {
  background: var(--color-bg-page);
  border-radius: var(--radius-sm);
  padding: 14px;
  margin-bottom: 24px;
  border: 1px solid var(--color-border-light);
}

.price-meta-item {
  display: flex;
  justify-content: space-between;
  font-size: 0.86rem;
  margin-bottom: 6px;
  color: var(--color-text-muted);
}

.price-meta-item:last-child {
  margin-bottom: 0;
}

.price-meta-item strong {
  color: var(--color-navy);
}

.price-features-list {
  list-style: none;
  margin-bottom: 30px;
  flex-grow: 1;
}

.price-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--color-text-main);
  margin-bottom: 12px;
}

.price-feature-item svg {
  color: var(--color-blue);
  flex-shrink: 0;
  margin-top: 3px;
}

.price-btn-wrap {
  margin-top: auto;
}

.price-notice-footer {
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  background: var(--color-white);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  max-width: 860px;
  margin: 0 auto;
  line-height: 1.6;
}

@media (max-width: 960px) {
  .pricing-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .price-card.popular {
    transform: none;
  }
  .price-card:hover {
    transform: translateY(-4px);
  }
}

/* Practical Tips (选购建议与使用技巧) */
.tips-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.tips-column-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  border: 1px solid var(--color-border);
  box-shadow: var(--color-card-shadow);
}

.tips-col-title {
  font-size: 1.25rem;
  font-weight: 750;
  color: var(--color-navy);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.tip-item-card {
  margin-bottom: 18px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--color-border-light);
}

.tip-item-card:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.tip-item-title {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 6px;
}

.tip-item-text {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

@media (max-width: 840px) {
  .tips-grid {
    grid-template-columns: 1fr;
  }
}

/* Knowledge Articles Section (知识文章卡片) */
.articles-section {
  background: var(--color-bg-page);
}

.articles-filter-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 32px;
}

.search-input-box {
  position: relative;
  max-width: 380px;
  width: 100%;
}

.search-input {
  width: 100%;
  padding: 11px 16px 11px 42px;
  font-size: 0.95rem;
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-white);
  color: var(--color-navy);
  outline: none;
  transition: all 0.2s ease;
}

.search-input:focus {
  border-color: var(--color-blue);
  box-shadow: 0 0 0 3px rgba(40, 120, 227, 0.15);
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-subtle);
  pointer-events: none;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  border: 1px solid var(--color-border);
  box-shadow: var(--color-card-shadow);
  display: flex;
  flex-direction: column;
  transition: all 0.25s ease;
}

.article-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--color-card-hover);
  border-color: rgba(40, 120, 227, 0.35);
}

.article-card-badge-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.article-badge {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-blue);
  background: var(--color-blue-light);
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

.article-read-time {
  font-size: 0.8rem;
  color: var(--color-text-subtle);
}

.article-card-title {
  font-size: 1.18rem;
  font-weight: 750;
  line-height: 1.4;
  margin-bottom: 12px;
}

.article-card-title a {
  color: var(--color-navy);
}

.article-card-title a:hover {
  color: var(--color-blue);
}

.article-card-summary {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
}

.article-tags-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
}

.article-tag-item {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  background: var(--color-bg-page);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-light);
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid var(--color-border-light);
  font-size: 0.84rem;
  color: var(--color-text-subtle);
}

.article-read-btn {
  font-weight: 600;
  color: var(--color-blue);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.article-read-btn:hover {
  gap: 8px;
}

@media (max-width: 960px) {
  .articles-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}

/* User Reviews Section (用户评价与真实反馈入口) */
.feedback-section {
  background: var(--color-white);
  border-top: 1px solid var(--color-border-light);
}

.feedback-card {
  background: linear-gradient(135deg, #F8FAFC 0%, var(--color-blue-light) 100%);
  border-radius: var(--radius-lg);
  padding: 44px 36px;
  border: 1px solid var(--color-border);
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  align-items: center;
  gap: 36px;
}

.feedback-title {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--color-navy);
  margin-bottom: 12px;
}

.feedback-desc {
  font-size: 0.98rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  margin-bottom: 16px;
}

.feedback-policy-notice {
  font-size: 0.82rem;
  color: var(--color-text-subtle);
  background: rgba(255, 255, 255, 0.8);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-light);
}

.feedback-action-box {
  background: var(--color-white);
  padding: 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  box-shadow: 0 4px 16px rgba(16, 42, 67, 0.05);
  text-align: center;
}

.feedback-action-box h4 {
  font-size: 1.05rem;
  color: var(--color-navy);
  margin-bottom: 8px;
}

.feedback-action-box p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

@media (max-width: 800px) {
  .feedback-card {
    grid-template-columns: 1fr;
    padding: 28px 20px;
  }
}

/* FAQ Section (常见问题) */
.faq-section {
  background: var(--color-bg-page);
}

.faq-list {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: var(--color-white);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: all 0.2s ease;
}

.faq-item:hover {
  border-color: rgba(40, 120, 227, 0.4);
}

.faq-question-btn {
  width: 100%;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-navy);
  gap: 16px;
  background: none;
}

.faq-icon-arrow {
  flex-shrink: 0;
  transition: transform 0.25s ease;
  color: var(--color-blue);
}

.faq-item.active .faq-icon-arrow {
  transform: rotate(180deg);
}

.faq-answer {
  display: none;
  padding: 0 24px 22px;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  border-top: 1px solid var(--color-border-light);
  padding-top: 16px;
}

.faq-item.active .faq-answer {
  display: block;
}

/* Footer (页脚) */
.site-footer {
  background: var(--color-navy);
  color: #D9E2EC;
  padding-top: 70px;
  padding-bottom: 40px;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand-col p {
  font-size: 0.9rem;
  color: #9FB3C8;
  line-height: 1.65;
  margin-top: 14px;
  margin-bottom: 20px;
}

.footer-logo {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--color-white) !important;
}

.footer-logo span {
  color: var(--color-cyan);
}

.footer-heading {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 18px;
  letter-spacing: 0.02em;
}

.footer-links-list {
  list-style: none;
}

.footer-links-list li {
  margin-bottom: 10px;
}

.footer-links-list a {
  font-size: 0.88rem;
  color: #BCCCDC;
  transition: color 0.2s ease;
}

.footer-links-list a:hover {
  color: var(--color-cyan);
}

.footer-disclaimer-box {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  padding: 16px;
  font-size: 0.8rem;
  color: #829AB1;
  line-height: 1.6;
}

.footer-bottom {
  padding-top: 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.85rem;
  color: #829AB1;
}

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

/* Article Template Styles */
.article-header-wrap {
  background: linear-gradient(180deg, #EDF5FF 0%, #FFFFFF 100%);
  padding: 48px 0 36px;
  border-bottom: 1px solid var(--color-border);
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
  color: var(--color-text-subtle);
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.breadcrumb-nav a {
  color: var(--color-text-muted);
}

.breadcrumb-nav a:hover {
  color: var(--color-blue);
}

.breadcrumb-sep {
  color: var(--color-border);
}

.article-hero-title {
  font-size: 2.3rem;
  font-weight: 850;
  line-height: 1.25;
  color: var(--color-navy);
  margin-bottom: 18px;
  letter-spacing: -0.02em;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 18px;
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

.article-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.article-content-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
  padding-top: 48px;
  padding-bottom: 80px;
}

.article-main-body {
  max-width: var(--max-width-text);
}

/* GEO Direct Answer Callout */
.geo-direct-answer-box {
  background: linear-gradient(135deg, rgba(40, 120, 227, 0.08) 0%, rgba(38, 180, 184, 0.08) 100%);
  border-left: 4px solid var(--color-blue);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  margin-bottom: 36px;
}

.geo-answer-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 800;
  color: var(--color-blue);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.geo-answer-text {
  font-size: 1.02rem;
  color: var(--color-navy);
  line-height: 1.7;
  font-weight: 500;
}

.article-body-text h2 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--color-navy);
  margin-top: 40px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border-light);
}

.article-body-text h3 {
  font-size: 1.25rem;
  font-weight: 750;
  color: var(--color-navy);
  margin-top: 28px;
  margin-bottom: 12px;
}

.article-body-text p {
  font-size: 1.02rem;
  color: #243B53;
  line-height: 1.8;
  margin-bottom: 20px;
}

.article-body-text ul, .article-body-text ol {
  margin-bottom: 24px;
  padding-left: 24px;
}

.article-body-text li {
  font-size: 1rem;
  color: #243B53;
  line-height: 1.75;
  margin-bottom: 8px;
}

/* Data / Comparison Tables */
.article-table-wrap {
  overflow-x: auto;
  margin: 30px 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  box-shadow: 0 2px 10px rgba(16, 42, 67, 0.04);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
}

.article-table th {
  background: #F0F4F8;
  color: var(--color-navy);
  font-weight: 750;
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.article-table td {
  padding: 13px 16px;
  border-bottom: 1px solid var(--color-border-light);
  color: #334E68;
}

.article-table tr:last-child td {
  border-bottom: none;
}

.article-table tr:hover td {
  background: #F8FAFC;
}

/* Article Sidebar */
.article-sidebar {
  position: sticky;
  top: 96px;
  height: fit-content;
}

.sidebar-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  border: 1px solid var(--color-border);
  box-shadow: var(--color-card-shadow);
  margin-bottom: 24px;
}

.sidebar-title {
  font-size: 1.05rem;
  font-weight: 750;
  color: var(--color-navy);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-light);
}

.sidebar-links-list {
  list-style: none;
}

.sidebar-links-list li {
  margin-bottom: 12px;
}

.sidebar-links-list a {
  font-size: 0.9rem;
  color: var(--color-navy);
  display: block;
  line-height: 1.45;
}

.sidebar-links-list a:hover {
  color: var(--color-blue);
}

.sidebar-cta-card {
  background: linear-gradient(135deg, var(--color-navy) 0%, #1A365D 100%);
  color: var(--color-white);
  border: none;
}

.sidebar-cta-card .sidebar-title {
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.15);
}

.sidebar-cta-card p {
  font-size: 0.88rem;
  color: #BCCCDC;
  line-height: 1.6;
  margin-bottom: 18px;
}

@media (max-width: 900px) {
  .article-content-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .article-hero-title {
    font-size: 1.75rem;
  }
}

/* Modal for Experience Sharing */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(16, 42, 67, 0.6);
  backdrop-filter: blur(4px);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.active {
  display: flex;
}

.modal-box {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 32px;
  max-width: 520px;
  width: 100%;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
  position: relative;
}

.modal-close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  color: var(--color-text-subtle);
  font-size: 1.25rem;
}

.modal-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-navy);
  margin-bottom: 8px;
}

.modal-desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

.form-group {
  margin-bottom: 16px;
  text-align: left;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-navy);
  margin-bottom: 6px;
}

.form-input, .form-textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.92rem;
  outline: none;
}

.form-input:focus, .form-textarea:focus {
  border-color: var(--color-blue);
  box-shadow: 0 0 0 3px rgba(40, 120, 227, 0.15);
}